I like the inventory and get what you need approach for wrenches and sockets. Crescent wrenches or (shudder) vise grips are ok a lot of times but sometimes you just have to have a reasonable quality wrench or socket in the right size or you can make things oh so much worse. This also implies getting decent quality stuff. Snap On is probably overkill but don't go much lower than Craftsman. I would tend to get mostly combo wrenches and 3/8 drive sockets unless you have a specific needs for something else.

Same is true for screw drivers and other tools since on a boat the last thing you want to do is make a small problem a bigger one by rounding or stripping something. Especially if the "walk" back to the store will require holding your breath for more than a couple of minutes.

- Eric